Carbon-holder for arc-lamps



D. WILLIAMSON.

G-ARBON HOLDER FOR ARG LAMPS.

(No Model.)

15.347.218. atenned Aug. 1o, 1.886.

* IIN bottom view of the same.

PATENT Ormea.

DAVID W'ILLIAMSQON, OF HARTFORD, CONNECTICUT.

CARBON-HOLDER FOR ARC-LAMPS.

L'PE'GIFECATON forming part of Letters Patent No. 347,'218, dated August 10, 1886.

Application filed January .23, 1886. Serial No. 189,454. (No model.)

To @ZZ whom t may concern:

Be it known that l, DAVID vl/TILLIAMsoN, a citizen of the United States, residing iu the city and county of Hartford, in the State of- Connecticut, have invented certain new and useful Improvements in Carbon-Holders for Electric-Arc Lamps, of which the following is a specification, reference being had to the accompanying drawings.

My invention is a device for adjusting the cal-bons, and particularly the -upper carbons, ot' electric-are lamps, and for holding any such carbon in its proper position relatively toits rod or other support, and to any other carbon of the same set or pair. My device for the accomplishment of this object is an adjust-able ball-and-socket joint between the carbon and the carbon rod or other support' of' such carbolrholder.

I proceed to point out the best mode of construeting and applying` my invention.

As already intimated, this invention is particularly adapted for holding and adjusting an upper carbon, yet mayv be applied to a lower carbon, if desired.

In the accompanying drawings, Figure 1 is` a top View of my improved carbon-holder, regarded as a holder for an upper carbon. Fig'. 2 is a front view of the same. Figs. 3 and 4 are side views of the same. Fig. 5 is a Fig. 6 is a sectional view of the same on the line a a in Fig. 3. Fig. 7 is the same without a set-screw. Fig. 8 is the same as Fig. 7, but with one segment of the ball displaced.

In the drawings, 3B and B' are two like segments of `a ball, B B', which is externally of a general spherical form, and has a central cylindrical hole, which lies lengthwise of vsaid segments, partly in each, and is of proper size to admit the carbon which is to be held. Around the edges of this hole, at opposite ends of the same, are like projecting annular ridges r r'. A setscrew, s, is tted radially through one segment of the ball' B B', at right angles to the before-mentioned hole which receives the carbon. This ball is surrounded by a socket-piece, S, containing a socket,whicl1 is of suitable size and shape to'reeeive and retain said ball, and to allow the latter to operate within the socket in the manner hereinafter explained. This socketpiece is externally ofgeneral cylindrical form, and internally presents the general fvorm of a hollow sphere. The topof the socket-pieceS is provided with a radial pencil, p, or other suitable means whercby the socket-piece may be conveniently embraced by or attached to the carbon rod or other support of the carbon.- holder. The bottom of the socket is partly open, so as to allow the carbon to enter the ball,-and so as to allow one of the annular ridges o* o" to reach througl1,or partly through, such opening. The other ot' said annular ridges encounters the top of the socket, the latter being made internally fiat in that part. On one side (obverse in Fig. 3) the socket-piece is eut away, so as to admit the ball B B', allowing the segments B and B to Vbe moved into or out of lthe socket, one at a time, in the manner illustrated in Fig. 8. On the other side the socket-piece is perforated radially by a hole, h,whieh is of suitable size and position to allow the set-screw s to pass through into the ball B B' when the parts are in position, and to allow a moderate degree of play of said screw in every direction in said hole lL. The latter is so located in the sockctpiece S that when the parts of the holder are put together, as shown in Fig. 6, neither of the segments B and B can escape from the socket.

All parts of this carbon-holder are of brass or other eleetrically-conductive material.

Such being the construction of my improved carbon-holder, the mode of its operation is as follows: One end of the carbon stick or pencil lwhich is to be held is inserted in the holder,

being pushed into and through the length of the cylindrical hole in theball B 'B'. By the use of the balland-socket joint so created between the carbon and the socket-piece S,

the carbon is then turned slightly and so much as necessary in any desired direction,and made to assume any desired position relatively to the socket-piece. yAt the same time the set-screw s is turned in upon the carbon. By this opera- IOO l. In un electric-are lump, u. bull eonsisting of two separable segments, und huvinr :t eentrul perforation in or between said segments, in combination with n soeket-pieco containing said hull7 and with n set-screw threaded th rough one of said segments und passing loosely through the wall ol' said socket-piece, suhstuutiully in the Inunner und for the purpose specified.

2. A socket-piece having un internal socket of general spherical forni, in combination with :L hollow hull eoniposed of iwo heinispherieal segments, which :1re separately introduced into said socket through un aperture in the socketpi'ece,:i11d are held therein hy u setserew,whieh I5 is threaded through one of sind segments and passes loosely through the wall of said socketpieee, Substantially in the manner :1nd for the purposenspeeiied.

In witness whereof I have hereunto set iny 2o hund in the presence of two witnesses.

D AVI D \VILLI AMSON.

Witnesses:

WILLARD EDDY,

{IoHARD H. MATHnn. 

